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Can anyone help me ID this USO optic?

Can anyone help me ID this optic? A family friend gave it to me a while back and I can't figure out the model to save my life, other than that it's a US Optics 1-4x. I'm hoping to get a sense for what it's worth as well, but for now I'd love to just know the model. Thanks in advance for any help you guys can provide. IMG_6185.jpg

Its a SN-4. The precursor to the sr-4c. If the glass is still good, illumination works, and turrets still track its a solid option and probably can grab 800 or so. Maybe a shade less because its such an old model. I still own and use 2 sr-4cs.

Thanks! I suspected it might be an SN-4, but I thought I had seen some SN-4s with push-button controls on the left side turret like the SR-4C, whereas this one is a twist knob that controls brightness of the reticle. Thanks for the info!